Characteristic

 

Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl₂.The compound forms several hydrates CoCl₂•nH₂O, for n = 1, 2, 6, and 9. Claims of the formation of tri- and tetrahydrates have not been confirmed. The dihydrate is purple and hexahydrate is pink. It is usually supplied as the hexahydrate CoCl₂·6H₂O.

Chemical formula: CoCl2•6H₂O

Molar mass: 237.93 g/mol 

Appearance: rose red crystals 

Density: 1.924 g/cm³ 

Melting point: 86 °C 

Boiling point: 1,049 °C (1,920 °F; 1,322 K)

Solubility in water: 43.6 g/100 mL (0 °C); 45 g/100 mL (7 °C); 52.9 g/100 mL (20 °C) ; 105 g/100 mL (96 °C)

Solubility: 38.5 g/100 mL (methanol); 8.6 g/100 mL (acetone), soluble in ethanol, pyridine, glycerol

Magnetic susceptibility (χ): +12,660•10⁻⁶ cm³/mol

 

Application

 

Cobalt(II) chloride hexahydrate has been used to study apoptotic effects in HepG2 cells. Also reported as a stabilizer for reconstitution of the radiopharmaceutical technetium-99m exametazime. It has been used in studies to examine heat shock protein expression of inflamed skin.